Which is the better buy? a. 1,323 ounces of topsoil for $410.13 b. 8 pounds of topsoil for $78.08

Option. A

Step-by-step explanation:

Covert Ounces to Pounds, or vice versa, I went with pounds.

1323 ounces = 82 pounds.

find the pound to dollar rate

A; 82 ÷ 410.13 = about 5

B; 8 ÷ 78.08 = 9.76

yes because there is exactly one y value for every x value

for function there can't be more than one value for every x value

x = ±sqrt(10)

step-by-step explanation:

5 - 2x² = -15

subtract 5 from each side

5-5 - 2x² = -15-5

-2x^2   = -20

divide by -2 on each side

-2x^2   /-2= -20/-2

x^2 =10

take the square root on each side

sqrt(x^2 )=±sqrt(10)

x = ±sqrt(10)

check:

5 - 2x² = -15

+sqrt(10)

5 - 2(sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15

-sqrt(10)

5 - 2(-sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15